This Air Cooler Is Doing Something No One Else Is! | Scythe Fuma 2

[@codywhite4981]

Probably the clockwise rotation of the fan made it more difficult to spin the Anemometer if they spin the same direction. Try flipping the Anemometer around.

[@jasongooden917]

I think your right

[@wiedehopf9068]

Also means that his other measurements are off, his airflow measurement should be independent of the swirl. Maybe add a cross of plastic fins into the 3d print, so the air can rotate while traveling through the duct.

[@garycaruso4883]

Yes, you need a diffuser, lookup wind tunnel diffuser, really cool idea making those 3D printed parts!

[@garycaruso4883]

actual airflow straightener :)

[@realhusky]

Flipping it will keep them same direction. Need a symmetrical anemometer

[@mfmeow206]

how about the fact its $55, damn near silent, and performs on par with noctua

[@LocutusH81]

Where did you see a noise normalized testing, this vs a noctua (wich?)? Because i didnt...

[@alessandro.marinoni]

I believe it's Tweaktown, but an easy search on Google will show you

[@SrUnr3al]

its on par with noctua up to 130W TDP, if you put 250W TDP on this thing, it will overheat.

[@maggi98mw]

@@SrUnr3al true, but it is a very good cooler for everything below a 9900k

[@anticx1648]

@@robert3374 but almost 50% cheaper (than d15)

[@R3TR0J4N]

subbed cus this reminds me the freedom of pc building, channel also features everything new, not just the upper mainstream hardwares. also educational lol

[@MeneGR]

Same here, just subbed, already binge watching!

[@XavierAncarno]

Hello I don’t find the channel you’re talking about What’s the KZbin name

[@stripes8812]

I just did too. I love your willingness to explore and experiment. A tinkerer's channel. NICE.

[@dusieqq]

i honestly dont get it why u are sooo underrated, your material prep is 10/10 you have a lot of knowledge and can do R&D by yourself, which tech youtuber can do that? you deserve much more subs

[@MajorHardware]

Thank you, that means alot

[@hokkypro]

You could have just slapped this on a bench, gave us some non relevant numbers and call it a day. BUT you didnt. You never do. That's why we love you buddy! Keep it up!

[@MajorHardware]

No problem, glad you found it entertaining.

[@granthampson5917]

Nice to see Scythe really putting out the box thinking and innovating to test for better performance. Great video

[@Phynix72]

PC hardware enthusiasts did it way before & left this idea for sake of noise.

[@secondc0ming]

Love the content, nice to find a tech channel doing things nobody else is.

[@Delzra]

The level of research and ingenuity you put into testing the airflow really screams a millions subs for me.

[@AaronAlso]

It's nice to see someone is finally doing it right. There is absolutely no advantage, and quite possibly some losses, to having multiple fans on a heatsink if they are not counter rotating. Although it could be better with a tuned duct around the heat sink the static pressure will increase even more with the counter rotating fans. At lest this is a step in the right direction.

[@derscarf3803]

it makes sense, since the rotation of the airflow causes the air to go through the anemometers finblades in a direction that is parallel to the blades, if u flip the anemometer it should work

[@MajorHardware]

Interesting take something I will take a look at tomorrow

[@djbenjibear4386]

Super badass yo. Can't wait to see you hit 100k

[@rzero21]

3:24 As an aviation enthusiast, mechanic and pilot, I'm glad you touched that topic!

[@rafalst]

I tought it was my bluetooth earbuds that were crackling/failing, but no, its the video itself, weird.

[@seymoronion8371]

I can confirm that the video itself has some issues with it's audio..

[@cicad2007]

Odd, my audio was just fine.

[@BadaBing_]

It's ASMR boyzz

[@Dreams_Of_Lavender]

Dude needs a new microphone or something.

[@ismaelyu5]

To actually use the "straight" airflow, you should test both, normal + counter rotating fans directly in front of the cooler to get the straight flow

[@EliteRock]

As it happens I'm about to try stacking a round-frame Scythe Kaze 140mm on my Noctua NH-U14S cooler (has a NF-A15 fan, also 140mm round frame), which will result in a giant ghetto-mod dual contra-rotating impeller fan.

[@Thomas_Speck]

My English is pretty bad, I apologize. Rotational Airflow can be "used to an Advantage" by a second Propeller rotating counterwise DIRECTLY behind the first, thats correct. But: If Airflow passes a Stack of Fins - it is not rotating anymore. So, the second counterwise rotating Propeller does nothing different as a Propeller that rotate in the same Direction as the first. For me this is only Marketing Vodoo.

[@craigtegeler4677]

With the narrowing of the air tunnel, thus you are creating a back pressure on the fan blades and actually slowing the fan motor down. The proper mounting and unrestricted airflow, with the exception of the mounting of the heat-sink fins assembly, presents virtually no back pressure; thus the fan can run at optimal air flow and rpm's If you take a car exhaust system and reduce the internal diameter to much, thus you have back-pressure would be too excessive and the engine performance can suffer! Same analogy, when applying physics! Even though you may be trying to create a vortex by the making or printing that said adapter, and trying to perform a CFM test or pressure test; you in turn very quickly find out that the fan doesn't have enough ass behind it to get the results that you may have come to have expected!

[@Yoshikaable]

I think you need a reversed anemometer for a reverse fan. Don't worry about that test - the results speak for themselves!! Thank you for this review, it was a lot of fun and I appreciate the quantitative (temps etc) and the qualitative (ram fit, sound) components to this review. Great work

[@HisNameIsRobertPaulson01]

I am blown away from this info in this video. Bad puns aside, I am impressed with the time you took to actually create the test environment you did with the 3-D printed tools for the fans to sit in to measure air flow. I loved the presentation with the cardboard box and the use of the fog machine to show how air moves through the fans. I haven't seen anyone even try to make something like that and other KZbin review videos, the presenter just throws different coolers on, run some test cpu test and put a mic nearby, and call it a day. You went the extra steps to show us much more. This is the first video of yours that I watched and I subscribed and now I'm looking forward to see if you go this in-depth in your other videos and what kind of content you will make in future videos.

[@MajorHardware]

I hope I dont disappoint glad you subbed

[@mikaelgaiason688]

The effect is negated when the airflow is channeled and straightened out in between the fans, so yes, this is just a marketing gimmick.

[@Dracconus]

@Izan TechnoMaster The SunbeamTech Twister 120 was the first to utilize contra-rotation in an air cooler, and it was extremely efficientat cooling 125w TDP CPU's such as the Phenom II x6 1100t. That said, I noticed zero difference once I strapped decent fans to it that weren't contra-rotating.

[@DakiniDream]

Let's say here that Scythe coolers are mostly very abordable price-wise. So yes, it may be a marketing gimmick, still they have very good cooler for a very nice price. They are just mostly less known by people than other brands.

[@mikaelgaiason688]

@Izan TechnoMaster Most reviewers don't understand basic physics. Having a channel doesn't require any scientific understanding. Just a camera and a following.

[@mikaelgaiason688]

@@Dracconus Exactly. The cooler was good, but the added gimmick was pointless and only served to attract buyers looking at similarly priced coolers.

[@mikaelgaiason688]

@@DakiniDream I still think that when a company tries to tack on a gimmick they should be called on it. Quality stands on it's own. Gimmicks turn me off and push me to competitors. Standards.

[@NicB-Creations]

I wonder if it's really all that benefecial considering the cooling fins in between pretty much straighten the airflow out.

[@popeizzy2012]

That's what I was thinking.

[@bradhaines3142]

thats exactly the issue, fins put it straight so it resets the flow direction instead of blowing one into the other. in this case 'contraflow' is entirely a gimmick

[@NicB-Creations]

@@bradhaines3142 Couldn't agree more.

[@zoommair]

Yeah, seems like just a marketing gimmick

[@753238]

it's beneficial overtime as it reduces torque in the cpu cooler which ease the cpu socket stress

[@smeggyhead1]

I suspect the "reverse flow" is a gimmick - the fins of the heatsink will remove most of the rotational component of the air before it reaches the second fan.

[@chaoswarriorbr]

^This Even if the air speed keeps the flow turbulent, the fins actually make the flow mostly directional and considered unmixed. If we were talking about fins very far apart (non practical and I've never seen mostly requiring a distance greater then two times the boundary layer to achieve a "open flow") it might be worth something to use this.

[@Ianochez]

yes but since the fins are in one direction, the rotational blades do actually make a sideway airflow, so facing a clockwise fan pushing air into horzontals fins, the upper fins that catch blade from left to right would make a diagonal from left to right airflow, and in the lower would be the inverse. but in the middle stacked fins, the airflow must be like you say and that could be the most of the part of the ariflow behaviour. the phenomenom I'm talking may not be as significant as I first though.

[@punksweeper4678]

Ill bet a design with concentric rings for fins would preserve the rotational airflow but dramatically increace the cost because each circle is a unique part rather than being the same fin stacked up (other than the ram cutout on the back)

[@KimonFrousios]

@@punksweeper4678 Curves are expensive. However a square pattern would be relatively achievable and prevent lateral flow of air. Possibly even a single 90degree fin closing off each open side of the stack and forcing all the air that goes into the stack to go all the way to the end of the stack would suffice. But I suspect in a push-pull dual fan configuration, the second fan's intake flow has a similar effect to a solid fin wall forcing the air to make its way along the fins instead of escaping laterally. The second fan already needed to counteract friction along the fins of large stacks, the wall becomes redundant which is why coolers don't have any. And in narrow stacks the lateral movement doesn't matter much anyway.

[@mrdespizeme]

You've created a venturi with your adapter. The speed of the air will be increased at the measuring point. The fan probably doesnt have enough static pressure, and is maybe creating a bit of a vacuum or 'equalization'. Just a stab in dark really, not sure.

[@DickTangoTV]

I think the primary benefit of this fan setup could be how easy it is to direct the hot air into a rear exhaust fan in a case. You might want to try this cooler in multiple configurations in a somewhat restrictive case to see if it affects temperatures, including GPU temperatures.

[@dorientjewoller113]

This Scythe Fuma 2 is an improved version of the previous Scythe Fuma Rev. B. Creating the same performance with less noise, without hindrance of the ram slots and a better mounting system. Beside the Scythe Ninja 5, this is the only cooler I know you can mount in a blitz with even the fans attached on it. 7 decibels difference between this cooler and it's predecessor, but only losing 1° C with it, is something we can't complain about. Beats out the Noctua NH-U12A in noise, on level with the Dark Rock Pro 4 and hell lot cheaper then the 2 mentioned coolers.

[@Thomot512]

Well the blade of the thick fan, have been designed to function inside of an airflow. If the air in front is not moving fast enough the angle of attack of the blade is not the one it has been designed to work with. It can lead to the blade stalling and therefore not producing airflow. When you put your hand in front it restricted the area the air had to go inside the fan and therefore accelerated it, bringing it nearer its design point making it more efficient.

[@MidnightMarrow]

If the air is flowing in a different rotation than your typical fan, the device used will likely fail to read it properly. Placing your hand behind it likely influenced the flow of the air produced enough to help spin up the anemometer.

[@AlphaMachina]

The issue with the Kaze 120 is exactly because it spins in the opposite direction from the anemometer. The reversed spiral airflow was stalling out the blades of the device.

[@steverpcb]

It's not the same contra rotation as a Bear bomber where the props are together, its more like a Cessna Skymaster with one at the front and the other at the back. The rear propeller has a higher pitch than the front as the air is already moving, a car uses a low gear to start moving and then changes to a higher gear. Reverse flow in a pc case is to pull cool air in from top rear and exhaust it front bottom, this has the advantage of sucking less dust and keeping cooling fins cleaner in the long term, dust falls all the way down so there is more at surface level. The fan not blowing through your test rig is caused by something called Fan Stall, the outlet is restricting the flow just enough to cause the air in the fan to spin inside it rather than go through, this is what happens when you block the nozzle of a vacuum cleaner and hear it rev up. Putting your hand in front blocks a little air allowing the fan to push the rest through normally. Check the rpm in free air and on your test rig, rpm goes up when stalled.

[@ismaelyu5]

Btw the counter rotating fan could be useful mounted at the end of the cooler, when having a case fan at the back, helping it to blow air out

[@Murph9000]

It's not just aviation. Marine propellers are *always* contra-rotating when there's a pair of them (side by side, not stacked, but it's essentially the same physics), and not just for efficiency as the sideways thrust would cause severe maneuvering problems at low speed.

[@marktackman2886]

thx for the info.

[@franzb69]

it's not caze kah zeh not zee or zii. zeh. like the E when pronouncing "error"

[@AllHailDotHack]

This needs to be at the top. Also, he should know that kaze in Japanese translates to "wind"

[@donaldreynolds4003]

@@AllHailDotHack Actually, kaze （風）translates to wind!

[@AllHailDotHack]

@@donaldreynolds4003 the more we talk about it the bigger the chance he'll see this lol. Thanks for the correction by the way.

[@donaldreynolds4003]

@@AllHailDotHack No problem! I hope he sees this, as I was cringing as he was saying it. My wife is Japanese, so we speak Japanese and some English here at home.

[@chuuzu]

Indeed. I'm not too fussed about pronunciations normally, but when it comes to brand-names; yeah he probably should put in at lest some minor effort if he want's to get taken seriously.

[@I8THEmagictoaster]

Secondary fan is probably designed for counter rotating air, not stagnate air. (Or better yet its designed to push allready moving air becouse the fins negate any spinning air)

[@Beverain]

ive heard sonar operators joke about with the Tu-95, they could hear it through sonar with the plane flying 10km above the ocean

[@fortheloveofcake93]

I think this proved the concept of the counter-rotation benefits. The smaller 15mm thick fan in front moves less CFM so having it designed this way lets it compete with a larger 25mm thick fan arrangement while still providing RAM clearance. I just bought one because this is the best performing air cooler that can fit in my case less than 160mm height.

[@ryanjofre]

I have a Ninja 4 with two 120mm fans on my old AM3 system. It’s a monster than can rival many small AIO water coolers!!! The only problem is the bloody memory clearance. Long live Scythe Thankyou for your efforts.

[@TheValenzuela480]

You’re about the only video I’ve found that actually speaks on the slim vs the non slim thank you so much answered all of my questions!

[@DakiniDream]

Scythe coolers are solid coolers. I run still one $cythe Muggen. This is an older one, but also a biggy, bit similar in look to the coolmaster pro4 in size. It's still doing very fine. There is also the Ninja for smaller builds, it's also a fine one.

[@c9rm3n]

I feel like I've personally seen jet engines that do this, have two sets of propellers that run opposite from each other. there are some easily searchable diagrams that show it. but searching 'contra rotating jet engine' isn't is helpful. Great videos, I've been watching your content for a few weeks now and you've earned a sub.

[@onboard3]

And there's me trying to perfectly line up my front intake fan with my CPU cooler level.. :D Those smoke patters are awesome, had no idea they are THAT bad using air straight forward.

[@turdfurguson2609]

Very cool and interesting uses of your 3d printers, for science!

[@radictm]

I think your anemometar is directional (and rotates the same way as the ''standard'' cooling fan). The contra-rotational Kaze 120 moves the air in a spiral that is opposite of the anemometar and it throws the results off. Someone in the comments said that you need an omni-directional anemometar (and I quess this will solve the problem since I don't know if anyone makes an anemometar with the contra-rotation as the Kaze 120). This is all speculation on my part put it has some logic to me. Awesome content BTW, very informational and original. You are gonna blow up soon!

[@Ianochez]

you could try mouting the heatsink on the airflow visualizator to see how the airflow turbulence are affected by the heatsink

[@rayzian]

was hoping to see this

[@oddballhippie7363]

I have a Scythe mugen 5 pcgh Push/pull. R3700X@4.4 Keeps it under 70c DEAD SILENT. My retro PC with a P4 478 Northwood runs at 3.6MHz! Cooled by a Ninja 2. (2xGentle typhoon 1450 RPM) Scythe coolers are the unsung heroes. Highly recommended!

[@donyx8889]

Man im going to get a scythe fuma2 for a ryzen 3800x, what do you think? I dont want to go for a noctua d15 because that thing is too big and it blocks the ram

[@blahorgaslisk7763]

Counter rotating propellers and fans are actually very common. Sunnon makes a line of 40mm fans with counter rotating fans. They spin at up to 15K rpm and are loud as f... loud as a loud, thing... The use of dual in line fans like this helps increase the static pressure more than increase the airflow, and making them counter rotating makes them just a bit more efficient. They are also somewhat redundant, as if one fan gives up the ghost the other can still provide some airflow until the machine can be serviced. There are also a lot of fans that use a stator, basically a non rotating fan placed after the actual fan, to straighten the air stream. I don't have any numbers on how much this improves efficiency, but it's apparently at least somewhat efficient. Fans like these are often used in servers where reliability and airflow trumps any regards for noise levels. Counter rotating propellers are also popular on motorboats, I even remember seeing them used on high power outboard engines, and here the advantages are well documented. On a motorboat counter rotating propellers are not only more economical, provide better acceleration and higher top speed, but they also eliminate side ways torque and a tendency to tilt the boat. The tilt can be mitigated using the trim planes and the sideway torque is usually not an issue at speed, but can make low speed maneuvers tricky, but eliminating the tilt using the trim planes cost a bit of performance. Just to make this a bit more complete there's also motorboats that use dual propellers, one on either side of the boat and has them counter rotating. This will eliminate the sideways torque, but doesn't give the same increase in efficiency and performance as using inline counter rotating propellers. Having dual propellers has other advantages such as increasing maneuverability at low speed. Counter rotating rotors are also used on some helicopters. Here there are not only advantages but also some serious disadvantages. As "usual" with counter rotating props the airstream will be a bit more efficient, and there is no torque trying to rotate the helicopter so there is less need for a tail rotor. I'm not sure if there are any commercial helicopters using coaxial counter rotating rotors and no tail rotor, though I guess it would be possible. There are however several disadvantages to coaxial counter rotating rotors on a helicopter. They add weight, the mechanics add complexity, and they limit the top speed as you can't use rotors which allow for the blades to flap (I think that's what they call it, it's been more than 30 years since I read up on this...). On helicopters the rotor hub can allow the blades to flap (move up and down somewhat which helps them survive the added load that high speeds put on them), lead-lag (precede or trail the hub rotation by a few degrees) and the hub controls the pitch of the blades. When using coaxial counter rotating rotors you can't really allow the blades to flap, or they could run the risk of hitting each other. Thus they use simpler hubs, often with only pitch control and this limits the performance at speed, and makes it impossible to fly at really high speeds. I'm bungling this... It's not like I'm an expert on helicopters, it's just that my brain has been good at sucking up just about any info I found interesting, and what kid didn't think it would be great to learn how to fly? But when that was thirty of forty years ago the details are a bit hard to remember.

[@EatMyYeeties]

Actually, the contra-rotating propeller is usually to kill off torque from the rotation of the props. The "straight" airflow won't be as affected considering the fans throws quite a bit of air outward during to centrifugal forces anyway. Cool concept! But I take it the size, shape, and number of fins are what give it its great performance.

[@petermeyer6873]

Hi there, I highly appreciate your efforts to do actual measurements. Here is the explanation, why your measurement setup doesnt perform how it should and how to improve it: Problem A: Your printed nozzle ist too steep and has kinks. This probably causes the airflow to seperate near the walls and thus the effective free diameter is reduced, resulting in even more drag, that blocks the airflow towards your anemometer. Problem A causes your setup to measure a too low airflow compared to what the fan could produce. To overcome that: A1. Make the nozzle longer to reduce the average angle below a value of 12° and A2. Smoothen the wall shape by letting the horizontal start go tangentially into a radius bent inwise, which in turn is followed tangentially by a radius bent outwise, which again is followed tangentially by the horizontal end with the smaller diameter for your anemometer. This method is not the absolute perfect way of doing it from the scientific point of view, but it has proven to work for a lot of excellent windtunnels around the world for the last 100 years or so. Problem B: Like Cody White allready has pointed out, the flow you are measuring is not straight but has a twist (vortex) to which your anemometer reacts either by responding to fully translate that twist into its own spinning, (allthough, if done right it should only be driven by the non-twisted portion of the flow!) and thereby measures a too high airflow. or - like for the case you mentioned - the twist in the flow is contraproductive to the straight portion of the flow in turning your anemometer. in the latter case you obvously measure a too low airflow. However, turning your anemometer around cannot overcome this problem, because any right hand screw will maintain its turning direction, no matter from what side its beeing screwed in. same holds for a left hand screw vice versa. Also is switching the electric flow direction to invert the fan turning direction a bad idea, as modern fan blades are obviously optimised for only one turning direction. - To overcome problem B you either have to straighten the flow before letting it in contact with your anemometer or use an anemometer, that is by design indifferent to vorticity. To straighten the flow you can do either of the following: B1. Print a flow straightener between the fan and the nozzle, that works for twists no matter what direction. you can find the design-rules for those, together with the nozzle-design mentioned above in the standard book for windtunnel design from allan pope: "low speed wind tunnel testing" (found in any good university library from the 1950s until today in its third edition or even as a pdf here: web.pdx.edu/~d4eb/chrome/J._B._Barlow,_W._H._Rae,_Jr,_A._Pope_Low_Speed_Wind_Tunnel_Testing.pdf). or B2. For each fan to be measured, scan its propellor, mirror it digtally, then print it out full scale. use this as a replaceable insert to your experimental setup either in front of or after the fan as an individual flow straightener (stator) to eliminate the specific vortex portion created by the fan.

[@brfritos]

I've always used Noctua products on my rigs. Granted they are expensive but unless you use a drill on the block, they last for life. And Noctua always provide free adapter's plate for the newest CPU sockets if you have the receipt, so keep those secure people. But recentelly I was on a very short budget and tried the Scythe Mugen 5 rev.B for a Ryzen 5. Not only this cooler's fan is quiet as Noctua's are, the block is also on par with them. The construction is very good and refined. The price? A half or less than half of the price of a Noctua cooler. Very satisfied with it and I would try other models in the future. The main difference between the companies is the package. Noctua's coolers comes with a variety of very good mounting manuals written by NASA, boxes for various types of parts and small divided boxes for everything. Scythe's Mungen and other models? One box for the cooler, one small for the parts all togheter inside a plastic bag and a mounting manual written by monkeys.

[@stephengehle9942]

You should make a new updated fan comparison video with these new test experiments you've created. Very informative.

[@MajorHardware]

good idea

[@wfb.subtraktor311]

since the flow meter also has a fan, the angular momentum created by the clockwise rotating fan made the air slip right past the fan blades with minimal friction

[@pixels303at-odysee9]

I put seven 90mm fans in a push pull configuration each having alternate rotation directions. It was really pulling the amps, and in the end had a stable and very loud airflow which was maybe 60% faster than running only one fan, but when attempting to stop the airflow, you could feel a significant pressure. The reason you don't notice much different cooling is because cooling has a direct relationship to air displacement, so unless you speed up the rotation of the fans by increasing the voltage or increasing the size of the fans, you shouldn't see much in terms of gains in cooling. If the push pull configuration was separated, so warm air from the first fan was exhausted rather than blowing that warm air over the center fan, you may observe a greater cooling effect. This could be achieved by separating the fins to allow two adjacent pull pull configuration where the air intake is in the center and is exhausted in opposite directions, you may achieve this.

[@Wahinies]

Dang! One thorough review of an unusual cooler thank you!

[@JD96893]

interesting product. i think one of the big advantages of this fan design is the air from the cooler can directed towards the exhaust fan easily.

[@matthartley2471]

Thank you for stating and proving both why a fan setup like this could possibly improve airflow, and why in this case you wouldnt expect it to. Excellent content, much better than "I tested it, and it made no difference. Guess that marketing hype was bullshit", which the video could have easily been.

[@MerrickOffTopic]

I kinda which you would have tested these TWO fans, against TWO fans for each of the opposing fans. For example 2 Noctua fans vs 2 Scythe fans. Still subbed tho lol, love your content ❤

[@JonathanDeane]

I just got one of those dual fan 6 heat pipe Snowman coolers. 2700X at stock cooler was crazy, like 90C+ playing a game and it sounded like a jet engine, the new cooler can play the same game and is near silent and now my temps max out just over 70C. Best 20 bucks I ever spent!!! (as a bonus no LED's...)

[@Bananagans777]

Nice review and appreciate all the methodology of testing the fans. Just one minor thing, with the rest of the weeb naming of the Scythe products Kaze would be pronounced “kah-zay” rather than “kayz”. Now I’ll stop being that guy.

[@Kazymedic]

Thank you for doing this for me. I am always that guy. It means wind.

[@tomashaddad]

It's "kah-zeh", but good try

[@awesomearizona-dino]

Nice work work on visuals. Yesterday ordered Scythe Mugen 5 Revb, for my 2500k, gunna hot rod it to 4.5, see if it is stable. SUBD 8-31...oh yeah nice 3D work.

[@mohdnorhalimzainudin7740]

I'm using mugen 5b on my 3570k @ 4.3. at ambient of 27C, it reached a bit above 70 during stress test. Add another fan to it and it went to lower 60. Quite impressive & silent too.

[@smileyguyz]

I think the Kaze 120 was too good of a blade design compared to the others. The anemometer's blade design was most likely affected more by more turbulent air from other fans, as shown by you placing your hand in front of the Kaze 120, creating an increase in air turbulence. The non-turbulent air likely was able to just travel trough the anemometer's blades, rather than turn the anemometer. Testing a low turbulence fan from the likes of Be Quiet! would create interesting results, due to them engineering their fan blades to create limited turbulence.

[@perhapsjames_]

Great video, just letting you know your audio is popping a bit in between(some static)

[@crazyrichbum]

I noticed the same. The clipping is a bit distracting

[@MajorHardware]

Ya me mic is a dumpster fire

[@WereCatf]

For me, the popping was very much distracting and bothersome. Better get a new microphone and get rid of the old one in some ridiculous fashion that'd make for a short, but funny video. Kill two stones with one bird, as they say!

[@MeneGR]

Lol thanks! I had audio playback issues on my previous windows installation, and I thought they came back just after the format!

[@cicad2007]

Odd, my audio was just fine.

[@nolansykinsley3734]

I think the fans entered what would be called a vortex ring state in a helicopter. The outside of the blades were not made close enough to the casing of the fan, and the thrust from them hitting the ducting was escaping back out the front from this gap and re-entering the fan's intake preventing any meaningful thrust.

[@DLTX1007]

I think I might be able to explain why the contra rotating fans wouldn't register on the anemometer, because the anemometer isn't a hot wire but rather a vane type, a reverse swept blade (in relative) will NOT spin the the vane anemometer which is setup for fans that have normal blades. Actually it doesn't "counter rotate" but rather the swept angle is reversed

[@Aphazenith]

Dude this is very Cool!! This answered some questions i had about PC fans!!

[@MrTchou]

The main goal of contrarotating propellers is to counter the torque induced by a normal prop, in a plane with one or more prop that turn all the same way, they induce a roll movement to the plane, the fact to have contra rotating props cancels this roll movement. same with heli, one rotor = you need a tail rotor to fight against the torque, if you have dual rotors separate or contrarotating you don’t need a tail rotor

[@MrTchou]

kzbin.info/www/bejne/rYGvpYCDmpt_Y6M

[@hyperdriverr]

I bought one the week it hit Newegg. I love it for its ram clearance. Also cooling is great and looks beefy!

[@farawaythrower]

"Standard PC fan spinny direction" -Major Hardware

[@MajorHardware]

Trade mark

[@allbromobro3505]

I could see LTT trying to hire this guy.

[@marktackman2886]

When I saw the 3d printed bracket then the box with smoke, insta sub.

[@kepler1175]

Loved the parallel to the aviation, even though you already got my like and I was definitely planning on subbing, I did it right there and then

[@KiraDenys]

Have you considered 3D printing your fan to anemometer shroud with flow straighteners/fins inside the neck? Also, you should try the fog box with the cooler attached (For science!), as I’m figuring that the mounting of the fan to the cooler is going to straighten the flow and it would be interesting to see how efficient the different fin designs are at straightening the airflow.

[@stevefox3763]

contra rotating works but in this case is pointless, the air from the leading fan has passed through the fins of the cooler and is NOT rotating!

[@bubbagump2548]

The fan moves more air when your hand is in front because they are high static pressure fans. Not meant to blow high cfm with little to no back pressure.

[@MrDutch1e]

It's because the fan spins in opposite direction vs what your meter is made the measure. If you could change the fan that takes the reading on the meter to opposite shape fins you'd get a reading.

[@ytQrash]

I think it would be interesting if you replaced both fans with ones from Noctua, specifically the NF-A12x15 (15mm slim fan) and the NF-A12x25.

[@haukikannel]

Qrash that would be interesting! How much it is the blades and how much configuration!

[@AMalas]

The only fan not getting a reading is spinning the opposite way, which is the reason I think. One thing you can do is add a bunch of small straws in the plastic shroud to create linear flow (SmarterEveryday anyone?). This should remove the effect of the rotation

[@Kualinar]

Whenever I see any dual fans setup where the fans are stacked, I get BAD case of flashback about the Thermaltake Super Orb... It was a setup where there is a smaller fan at the bottom of the radiator blowing air up, and a larger one at the top blowing air down. This caused all of the air from the bottom fan to go through the radiator twice.

[@huntterkiller117]

I just got this thing, i like it. Super quite, good looking, and works well. Id recommend it to anyone who wants air cooling

[@manyamaggot]

Amazing work for a little channel, I'm impressed

[@Spudinske]

Hey cool video! Just wanted to let you know that your video has strange audio stutters and distortions for milliseconds at a time. Examples at 3:10 and 3:58. I've tested on my Android phone, Windows 10 PC, and iPad

[@rolanie3727]

Thought it was just me. Thanks for the comment, quickly verified my sanity.

[@Dirtyboxer1]

5:30 I think it's safe to say that he's a fan of this kind of content...

[@taiiat0]

one cross test i was hoping to have seen was say, comparing the included Fans with 2 of some other Fan with the smoke test, both with just the printed shroud but also ideally through the actual Heatsink too. then you could see if the reverse rotation was making a difference.

[@AJBtheSuede]

As you can see from your non-restricted outlet smoke test, an axial fan actually doesn't produce much purely axial pressure (unless you're using several rows of stator veins, like in a turbine). Most of the pressure - and hence most of the flow - is directed in a spiral that EXPANDS out from the centerline at about 45º out from a point near the blade tips. That's why your smoke test looks like a wide cone of air. Even static pressure optimized fans need a rather large expansion volume behind the outlet to work properly. Your anemometer test would have worked just fine if you inverted rotated the so that it sucked air in from the restricting cone where you mounted the flow meter.

[@carbon_wavelight]

This is dope, loved learning about contra rotation propellers!

[@bigbuckoramma]

It would be curious to see the smoke test repeated, but with the fans blowing through the cooler. And then repeat the same test with standard fans on the same cooler. Be interesting to see if there is any direct difference in the airflow shaping post cooler. Because if you can direct the majority of the exchanged heat directly to the rear exhaust fan, then there could be a net benefit. Because we already know how much of an improvement a rear case fan makes on CPU temps with a tower style cooler.

[@ChrisGR93_TxS]

6:25 that's what they use on cars. Pulling air from restricted airflow radiators especially when there're more in stack rads *intercooler a/c and engine cooling* This kind of fan is made for high static vacuum pressure. I don't know the exact terminology but this fan cannot pull air without something restricting the intake from the center. The suction comes from the sides and when its unrestricted air escaping from the same side towards the center.

[@boelle1234]

Try mounting 4 fans on a equally sized cpu cooler. Double push-push / pull-pull

[@boelle1234]

JUST DO IT

[@chaoswarriorbr]

The adaptor is probably causing a total pressure loss by constricting the flow, so the speed hitting the anemometer is just insufficient to measure. You have to calculate pressure loss to design such adaptors, specially considering most computer fans aren't exactly known for high pressure flows.

[@CrustyAbsconder]

I am curious if there is any inexpensive mod you can do to the fin-stack to make it more efficient. Like putting a shroud over it to funnel the direction towards the exhaust fan ? metal shroud or plastic shroud ? or putting a fan inside your case a few inches from the memory blowing towards the cooler or using three 140mm fans on the cooler ? or drilling tiny holes in the fins. or filing some of the holes with liquid metal ??

[@pigeonpallz1733]

Its berry smart for them to realize this as far as how the aviation industry uses it and applying to a cpu cooler . great video thankx

[@ismaelyu5]

But in the wrong way.. just half baked idea

[@pigeonpallz1733]

@@ismaelyu5 I still like the creative idea and think they should keep it up as far as perfecting and coming up with new innovative products

[@AlphaMachina]

The issue I see with this is that the contra-rotational effects would very likely be completely or almost completely nullified by the fin-stacks between them, essentially making the method pointless in this application. For this to have any effect at all, and I don't even think it would have much of an effect, if any, would be for the fans to be back-to-back. Yeah, this is a gimmick.

[@greatdragonofra]

Hi man, great video as always. Just here to offer some constructive cricism if you do not mind. I do not think your setup at 5:04 is a great idea to measure airspeed. Since that bracket just gave the air more energy according to Bernoulli. Or less depending on the way the fans are mounted. But otherwise great stuff man, love your vids

[@MajorHardware]

Greed however that's why I didn't compare them to listed specs just verses other. This keeps everything even

[@greatdragonofra]

@@MajorHardware I see where you are going, but that's the thing, the speed is squared in that equation, so what would seem like a small difference in regular circumstances, may seem like a larger one now. So, If you really wanted to do a setup like that, I would advice to just make a tube, even size all along, with a mounting hole in which you can stick the meter in the "free stream". Still you will be altering numbers, but since there is no reduction of the tunnel size, the differences will be more true to reallife performance than they are now. Thanks for your time!

[@hughluttrell6350]

You didnt mention the reason i will buy this ease of installation the center fan can be mounted first,then be installed in the case using there long screwdriver .The screws are retained in place on the bracket.The onlything i have to watch not to drop is the screws mounting the plates to the motherboard.Will be the first addition to my new test case.

[@Smedleydog1]

My boat has a twin prop outdrive with counter rotating props. They are more efficient than a single prop. Less slip.

[@RogerThat1945]

Best cooler I've had since the CNPS14X

[@WesLott3rd]

First of all, thanks for this "well thought out video. its a refreshing depart from the status quo. If you want to know why the thin fan has no static pressure, look at its smoke pattern, how its so spread out, and its lack of organization. The duct you made blocks this fan's normal flow pattern, this kills most of its energy. This thin fan's airflow is specifically designed to be used with the other fan. "Engineered air flow", great idea; Its about time someone used this application on a CPU cooler.

[@joshlaw2273]

Maybe try adding some duct work what expands after you wind tester back to the original size, also by forcing the air flow into a smaller size like that it would have to increase air speed, because the same volume of air going in would have to move faster in a smaller capacity chamber, maybe you need to be able to just mount in a chamber that is just square and keeps the air flowing straight through instead of shrinking

[@huerta25264]

you sir deserve more subs. lots of quality content!

[@MajorHardware]

I appreciate that!

[@H3xx99]

I miss my scythe Ultra Kaze fans. I had 6 of them in one case. Had to keep it chained to the desk otherwise it would fly around the room..

[@TCPUDPATM]

Innovative tests! Nice video man.

[@RoKishDubbz]

Been watching some of your videos lately. Fresh and entertaining content, mate. Subbed right now, young JayzTwoCents

[@getyourmurderon]

the real reason is likely they got the motors at scrap cost or free because a company soldered or designed a bunch of the fan PCBs incorreclty. lot cheaper to change direction of plastic than rip down a bunch of motors.

[@Sonriah4145]

The rotational forces were counter to the rotation of the tester. If you put a grid in to normalize the air flow this should get you a test result.